corneal lens lens

inertial [reference] frame， inertial [reference] system

optical reference filter wavelength standard reference material

corneal lens（lenses） lens

Lens-to-lens interval

object lens objective lens

objective lens object lens

plane-concave lens (=plano-concave lens)

plane-convex lens (=plano lens)

short focal length lens (=short-focus lens)

variable focus lens vari-focus lens

vari-focus lens variable focus lens

(thermo) reference material

137Cs reference inventory

3D forward looking reference map

3D reference system

5 reference

95% reference range

ABC REFERENCE FRAME

absolute cell reference